package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.dishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private dishMapper dishMapper1;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品，同时插入菜品对应的口味数据
     * @param dishDTO
     */
    @Transactional    //两个操作数据库的方法要么同时失败，要么同时成功
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper1.insert(dish);

        //获取insert语句生成的主键值
        Long dishId=dish.getId();
        List<DishFlavor> flavors=dishDTO.getFlavors();

        if(flavors!=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });

            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page =dishMapper1.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除——存在启售中的菜品，不能删除
        for (Long id : ids) {
            Dish dish = dishMapper1.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前的是否能够删除——菜品关联了套餐，不能删除
        List<Long> setmealIds=setmealDishMapper.getSetmealIdByDishId(ids);
        if(setmealIds!=null&&setmealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        //删除菜品表中的数据
//        for (Long id : ids) {
//            dishMapper1.deleteById(id);
//            //删除菜品表中关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //删除菜品表中的数据
        dishMapper1.deleteByids(ids);

        //删除菜品表中的关联口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 更新菜品信息
     * @param dishDTO
     */
    @Override
    public void update(DishDTO dishDTO) {
        //修改菜品的基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper1.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors!=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据id来查询菜品数据
     * @param id
     * @return
     */
    @Override
    public DishVO getById(Long id) {
        //查询菜品数据
        Dish dish= dishMapper1.getById(id);

        //查询口味数据
        List<DishFlavor> flavors=dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
            .categoryId(categoryId)
            .status(StatusConstant.ENABLE)
            .build();
        return dishMapper1.list(dish);
    }

    /**
     * 设置菜品的状态
     * @param status
     * @param id
     */
    @Override
    public void setStatus(Integer status, Long id) {
        Setmeal setmeal = new Setmeal();
        Dish dish = new Dish();
        //判断该菜品是否关联了套餐
        if(status==StatusConstant.DISABLE){
            List<Setmeal> setmealList=setmealMapper.getByDishId(id);
            //如果关联了套餐，则将套餐和菜品都进行停售
            if (setmealList!=null&&setmealList.size()>0){
                for (Setmeal setmeal1 : setmealList) {
                    setmeal.setStatus(status);
                    setmeal.setId(setmeal1.getId());
                    setmealMapper.update(setmeal);
                }
            }
        }
        dish.setStatus(status);
        dish.setId(id);
        dishMapper1.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper1.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
